Could not load file or assembly 'System.ValueTuple'

Question

I\'ve got a VS2017 project that compiles to a DLL which is then called by an EXE written by someone else. Both projects target .Net Framework 4.6.2. I rewrote one of my DLL

Answer 1

I had a library which used a newer version of the System.ValueTuple NuGet package. I then used another library which caused me to use the older version installed in the main project for the first time. That caused this exception to reveal itself. Updating both (or, converging them in any way - downgrading both is fine too) - fixed the issue.